Pleural mesothelioma in a brake mechanic

Our plain-English summary of Pleural mesothelioma in a brake mechanic, by M. Huncharek, J. Muscat, J.V. Capotorto (British Journal of Industrial Medicine, 1989).

The study

• Authors: M. Huncharek, J. Muscat, J.V. Capotorto
• Journal: British Journal of Industrial Medicine
• Published: 1989;46(1):69-71
• Type of article: Case report
• Cited by: 13 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text
• In J-M's library: Johns-Manville's company medical library held a copy (J-M no. 000101).

Summary of the article

The authors described a case of pleural mesothelioma in a car brake mechanic whose only known asbestos exposure (chrysotile) came from 11 years of clutch and brake repair work. A 47-year-old man who had never smoked was admitted to hospital in November 1983 with right-sided pleuritic chest pain, shortness of breath and weight loss. He had had recurrent pleural effusion since 1978. Imaging showed a nodular pleural mass encasing the right hemithorax, with rib destruction and mediastinal lymph node involvement. Excisional biopsy showed epithelial malignant mesothelioma. He began chemotherapy with cisplatin, adriamycin and cyclophosphamide but refused further treatment in March 1984. He was readmitted in May 1986 and died later that month. Necropsy, histochemical and immunocytochemical staining, and electron microscopy supported the diagnosis. From 1966 to 1975, at ages 30 to 41, he had worked as a brake mechanic in five service stations or car dealerships. He often used compressed air to blow out brake drums, which created dusty conditions. No asbestos exposure was known in his other jobs. The discussion reviewed earlier studies that found chrysotile in brake drum dust and measured fibre concentrations during brake repair. The authors concluded that the mesothelioma risk from chrysotile exposure during brake and clutch work was poorly defined. They stated that better estimates of exposure, fibre characteristics and chrysotile's causal role were needed.

PubMed has no abstract for this study, and the article doesn't print one. We wrote this summary from the full article with the help of AI. It is not the authors' wording.

In plain English

This article is a case report about one man, a car brake mechanic, who developed malignant mesothelioma of the right pleura. He was a 47 year old lifetime non-smoker admitted to hospital in November 1983 with chest pain and shortness of breath. He had had recurrent pleural effusion since 1978. A biopsy showed malignant mesothelioma of the epithelial subtype. He began chemotherapy, refused further treatment in March 1984, and died in late May 1986. At necropsy, the tumour had invaded the right lung, chest wall, mediastinum, pericardium and diaphragm, and had spread to the left lung and heart. The authors stated that his only known asbestos exposure, which they described as chrysotile, came from clutch and brake repair work from 1966 to 1975. That work included using compressed air to blow out brake drums, which he said created dusty conditions. No asbestos exposure was known from his other jobs. The authors concluded that the mesothelioma risk from brake and clutch maintenance was poorly defined. They noted the controversy over chrysotile and called for better estimates of exposure.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: case report (a single patient)
• Who was studied: One 47 year old lifetime non-smoking man in the United States, admitted to hospital in November 1983, who had worked as a car brake mechanic
• Exposure: Asbestos, described by the authors as chrysotile, from clutch and brake repair work over 11 years (age 30 to 41, 1966-75) at five service stations or car dealerships. He reported exposure from clutches, fly wheels and brakes, often used compressed air to blow out brake drums, and occasionally used a face mask of unknown type.
• Main results:
  • Biopsy in 1983 showed malignant mesothelioma of the epithelial subtype in the right pleura; the left lung and pleura were free of disease at that time
  • A CT scan showed the tumour encasing the right side of the chest, extending into the chest wall with rib destruction, with massive involvement of the mediastinal lymph nodes
  • The patient began chemotherapy in November 1983 but refused further treatment in March 1984; he died in late May 1986
  • Necropsy showed malignant mesothelioma of the right pleura invading the right lung, right chest wall, mediastinum, mediastinal lymph nodes, pericardium and diaphragm, with metastases in the left lung and heart
  • Staining and electron microscopy of tumour tissue were considered consistent with mesothelioma
  • He had a history of recurrent pleural effusion since 1978; a check up for a right pleural effusion in 1978 was negative for malignancy
  • He was not known to have been exposed to asbestos in his earlier jobs (army aircraft mechanic, heavy equipment factory, car assembly line) or in his later job in a wrecking yard, and recalled no non-occupational or environmental exposure
• The authors' conclusion: The authors concluded that the risk of mesothelioma from chrysotile exposure during brake and clutch maintenance and repair was poorly defined. They said that better estimates of exposure duration and intensity, of fibre characteristics, and of chrysotile's role would define the risk more accurately.
• Limitations the authors state:
  • The authors noted that the carcinogenic potential of chrysotile asbestos in humans was controversial at the time
  • The authors stated that better estimates of the duration and intensity of exposure were needed to define the risk

Topics

The National Library of Medicine indexes this study under subjects our site covers: Auto mechanics and brake work, Mesothelioma.

Medical terms in this study, explained in our Lexicon: Pleural Mesothelioma, Asbestos Exposure, Chrysotile, Pleuritic Chest Pain, Pleural Effusion, Hemithorax, Biopsy, Malignant Mesothelioma.

Related studies

• Brake mechanics, asbestos, and disease risk — M. Huncharek (1990)
• Cumulative asbestos exposure for US automobile mechanics involved in brake repair (circa 1950s-2000) — B.L. Finley, R.O. Richter, et al. (2007)
• An evaluation of short-term exposures of brake mechanics to asbestos during automotive and truck brake cleaning and machining activities — R.O. Richter, B.L. Finley, et al. (2009)
• The hazards of asbestos for brake mechanics — B. Castleman, L.A. Camarota, et al. (1975)
• Mesothelioma among brake mechanics: an expanded analysis of a case-control study — P.A. Hessel, M.J. Teta, et al. (2004)
• Asbestos fibres in the lungs of an American mechanic who drilled, riveted, and ground brake linings: a case report and discussion — M.M. Finkelstein (2015)

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